AP ref 25643 in YG Aka the “Sun-Ray” tourbillon from the 1980s. Rare and quite unknown reference from AP, but still very historically important......This was the first ever automatic tourbillon watch made, and the thinnest at under 5 mm! A record it maint

First serially produced self-winding tourbillon wristwatch in the history of watchmaking, the ref. 25643 was introduced in 1986 . It was, at the time, the world’s thinnest automatic wristwatch tourbillon, the world’s smallest and lightest tourbillon, and

Audemars Piguet is one of the few major watchmaking companies that has been able to remain a family run business. It has retained its worship of quality and fine finishing in the place of the worship of profit as has fallen most of the rest of industry wo